Incandescent lamp with concentrated metallic filament.



H. J. JAEGER.

INCANDESCENT LAMP WITH CONCENTRATED METALLIC FILAMENT. APPLICATION FILEDMAR. 16. 1915.

1 ,56'? 9 Patented Feb. 19, 1918.

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HERMAN J. JAEGER, 0F WEEHAWKEN, NEW JERSEY, ASSIGNOB T0 H. J. JAEGEE,COM- nnw JERSEY,

A COREORATION OF NEW J ERSEY.

ENCANDESCENT LAMP 'l/VITH. CONCENTEATED METALLIC FILAMEN'E.

Application filed March 16, 1915.

To all whom it may concern:

Be it known that l, HERMAN J. Janene, a citizen of the United States ofAmerica, and a resident of 'Weehawken, county of Hudson, State of NewJersey, have invented certain new and useful Improvements inIncandescent Lamps with Concentrated Metallic Filaments, of which thefollowing is a specification.

This invention has reference to improvements in incandescent lamps withmetallic filaments. The invention pertains particularly to lampsprovided with concentrated metallic filaments as the incandescing andlight emitting body. These concentrated filaments contain a relativelylong incandescing wire in a rather small space, and therefore the lightemitted from such filament also is concentrated and the size ot thebulky lamp globes may be reduced for economic reasons and shippingpurposes.

The concentrated metallic filaments heretofore used were secured orattached with one end to one lead and with the other end to the otherlead so as to have the single sections or filaments in series. However,between the leads a relatively large space remains empty in lamps of thedescribed construction and therefore the light efiect is impaired in sofar as these filaments are usually arranged in a portion of a circle.The empty space or portion of this circle does not emit light which isan undesirable feature.

In order to overcome the described defect l have produced incandescentlamps with concentrated metallic filaments wherein the said filaments"form an uninterrupted and complete light emitting body between theleads and in the preferred construction a complete circle or ring orapproximately such circle or ring. Accordingly the light emittingsurface is uninterrupted and in the case such surface being a ring orcircle the appearance of the incandescent body is that of a glowingball, especially in large lamps of standard voltage when the singlesections or portions of such filament are bent up and down as is done inpractice with certain lamps.

in order to have perfect electrical conditions in an all closedincandescent filament such filament is divided into two halves ofSpecification of Letters Eatent.

Patented Feb. 19, 11.918.

Serial No. 14,632.

even voltage, and two ends of such two halves are secured to one lead.and the two other ends to the other lead so that the current traverseseach half of the filament independently. Should tor one reason oranother, one half of the filament burn out, then the other half emitslight because it is of the required voltage, and the lamp may be usedthe same way as former lamps which have an open space between the leads.

In order to render the invention entirely clear, reference is had to theaccompanying drawing, in which:

lfigure 1 represents in elevation, partly broken away, an incandescentlamp with concentrated metallic filament closed all around andrepresenting a lamp of low voltage,'such as used in automobiles.

Fig. 2 illustrates on an enlarged scale, in top plan View, such lowvoltage filaments and the tops of the two leads to which they areattached.

Fig. 3 shows in elevation, partly broken away, an incandescent lamp withtwo high voltage filaments, representing a lamp oi" standard voltage.

Fig. 4: illustrates in top plan view 'llament shown in Fig. 3 anchorsand leads.

Similar characters of reference denote like parts in all the figures.

Ehe automobile lamp represent i l and 2 comprises the vacuun which maybe of any suitable sl instance shown it is a globe or. support and a, dare the leads. e tinuations 0 d of the leads preferably" are fine tubes,and the ends of the concentrated semi-circular filaments e, f are placedtherein, as shown in Fig. Q. The ends of the filaments are secured tothe tubes by pressing the upper portion of each tube together. Eachsemi-circular filament e, f is of the same voltage so that the currenttraverses each independently and lights it up. The effect of the lighthowever, is an uninterrupted circle and gives the impres sion of aglowing ball. It is evident that in small lamps, such as are used inautomobiles and for battery purposes, no special sup ports or anchorsare required because such short concentrated filaments are self porting.

with supports supe a u w The lamp of standard voltage illustrated 1nFigs. 3 and 4 comprises a vacuum chamber a of any suitable form, butgenerally the globular shape shown is preferred. The

leads 0 03 their continuations 0 d may be tubes or Wires, the latterthen forming a small tube at the top. In order to bring the relativelylong concentrated filament for a standard amp into a rather small space,same is of particular construction. Such filament requires the usualanchors and supports.

Centrally from the flat portion 6 of the stem 6 a wire or support 9rises upwardly and carries a glass support it. The larger portion ofthis support consists. of a glass ring into which the anchor supports2', j are fused. These supports carry anchors is, Z which rise to aconsiderable height and therefore are provided with the supports z, j.The glass ring further carries four wire anchors m, 12,-0, p. Theincandescing body consists of two independent concentrated metallicfilaments r, s. The ends of the filaments reach into the continuations 0d of the leads and are secured therein by clamping them. In order tofurther reduce the space occupied by the two filaments the same are-bentup and down, as shown in Fig. 3. For the purpose of supporting thesingle sections of the filament the anchors herein described areprovided, the higher anchors supporting the high bends of the, filamentsections and the lower and shorter anchors the lower bends thereof. Inorder to allow of the expansion of the filament sections the highersupports form relatively large rings 70 Z while the top ends of theshorter anchors simply form hooks. For additional security of the lampthe glass ring of the support It may be provided with two small are ofusual construction and wires t, u which are tied to the leads as shownin Fig. 3.

It is evident that in the large standard voltage lamps each half of thefilament also is of the same voltage as the" other so that eachsemi-circular bent as described, becomes independently incandescent andone emits the same amount of light as the other. Each filament usuallyis made of 120 volts and according to the described arrangement eachfilament forms an entirely independent illuminant. The light effect ofsuch a large lamp-of standard voltage of course is more pronouncedrelative to its appearance as a glowing ball than a small automobilelamp also for the, reason that each filament is bent up and down, asshown in Fig. 3. No empty space is left be tween the leads and the lightemitting body is closed in itself the same as herein described withreference to the small low voltage lamps for automobile and batterypurposes.

I claim as my invention:

A metallic filament lamp comprising a globe with an inner stem and twoleads having their ends opposite each other, rod with top rim fused tothe stem, rality of alternately long and short filament concentratedfilament,

supports in said rim, and two semi-circularly arranged concentratedtungsten filaments alternately bent down and up to connect with theshort and long supports and retaining the outlines of a circle.

Signed at New York, N. Y.', this 13th day of March, 1915.

HERMAN J. J AEGER.

Witnesses:

IDA E. ROLAND, ELEANORE HoFrMA'NN.

